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Reaction of Metals with Acid

5g of Mn 2nd ...

Question

5g of Mn 2nd on reaction with HCl forms 1.12L of Cl2 gas at STP.The %impurity of Mn 2nd is?

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Solution

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M n O_{2} + 4 H C l \to 2 H_{2} O + M n {C l}_{2} + {C l}_{2}

M n O_{2}

H C l

2.24 L

{C l}_{2}

M n O_{2}

M n = 55 g / m o l

10

M n O_{2}

H C l

0.1

C l_{2}

M n = 55

M n O_{2}

M n O_{2}

H C l

1.2

5 %

1.12 L

C l_{2}

M n O_{2} + 4 H C l \to M n C l_{2} + 3 H_{2} O + C l_{2}

x

M n O_{2}

H C l

1.2 g

m L^{- 3}

5 %

1.12 L

C l_{2}

M n O_{2} + 4 H C l \to M n C l_{2} + 3 H_{2} O + C l_{2}

M n O_{2} + 4 H C l 100 % - -- \to M n C l_{2} + C l_{2} + 2 H_{2} O

17.4 g M n O_{2}

500 m L

H C l

7.3 g

H C l

M n = 55 g / m o l

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